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in·di·ca·tor

n :  a substance (as a dye) used to show visually usu. by its capacity for color change the condition of a solution with respect to the presence of free acid or alkali or some other substance (as in detecting the end point of a titration) <litmus and phenolphthalein are acid-base s>  .
 
 
 
Similar sounding terms:  in·duc·tor 

 
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